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Grape Mealybug Phenology

Devin Carroll, Advanced Agricultural Services

(From various locations in the San Joaquin Valley)

Note: these dates are the first observation.  We typically treat with residual materials about 10-15 days after the first appearance on leaves, or with knockdowns    about 30 days after the first on leaves.

 

year

2nd instar

male cocoon

egg sac

hatch

on leaves

new male

2000

 

4-11

5-11

6-5

6-12

7-11

2001

 

4-17

5-14

6-4

6-12

7-11

2002

 

4-17

5-15

6-4

6-14

 

2003

 

4-19

5-16

6-3

6-16

 

2004

3-20

4-3

5-5

5-25

6-8

 

2005

 

4-4

5-2

5-17

 

 

2006

3-24

4-14

5-19

6-2

6-14

 

2007

3-13

4-11

5-9

5-31

6-13

 

2008

3-11

4-16 

 5-15

6-4 

 6-16